Yazarlar
- Duran, Celal(26)
- Ozdes, Duygu(21)
- Baltaci, Cemalettin(10)
- Gundogdu, Ali(10)
- Gül, Abdulkadir(9)
- Çullu, Mustafa(8)
- Aksüt, Yavuz Selim(7)
- Baltacı, Cemalettin(7)
- Barut, Abdulkadir(7)
- Bozbeyoglu, Pinar(7)
- Erol, Ismail(7)
- Ozeken, Sengul Tugba(7)
- Peker, Iskender(7)
- Eker, Hasan(6)
- Külekçi, Gökhan(6)
- Altuner, Elif Esra(5)
- Ar, Ilker Murat(5)
- Güzel, Melih(5)
- Karahan, Selim(5)
- Karpuz, Ömer(5)
- Kıranşan, Murat(5)
- Odabaş, Halil İbrahim(5)
- Seferoğlu, Mehmet Tevfik(5)
- Uysal, Turan(5)
- Demir Şahin, Demet(4)
- Imamoglu, Mustafa(4)
- Karpuz, Omer(4)
- Top, Yener(4)
- Akar, Bülent(3)
- Akpinar, Muhammet Vefa(3)
- Akpınar, Özlem(3)
- Avci, Ibrahim(3)
- Aydoğmuş, Ercan(3)
- Bozbeyoğlu, Pınar(3)
- Cakir, Mehmet Ali(3)
- Camoglu, Aslihan Yilmaz(3)
- Cavusoglu, Ibrahim(3)
- Daulay, Amru(3)
- Ercikdi, Bayram(3)
- Komut, Osman(3)
Yayınlar
- MakaleAçık Erişim2023Adsorption Behaviour of EDTA Modified Magnetic Fe3O4 Coated Brewed Tea Waste on Cr(VI) Removal
Yilmaz Camoglu, Aslihan; Ozdes, Duygu; Duran, Celal
The study focused on fabricating a novel magnetic Fe3O4 loaded and EDTA modified brewed tea waste (TW-Fe3O4-EDTA) as a cheap, environmentally friendly, and efficient adsorbent for the removal of Cr(VI) ions from aqueous medium in a batch system. Characterization of the prepared adsorbent was performed with different techniques. Adsorption experiments were implemented at different conditions including initial solution pH (1.0–7.0), equilibrium time (1–480 min), adsorbent dosage (1.0–20.0 g L–1), and initial Cr(VI) concentration (50–1000 mg L–1). The optimum adsorption performance was observed at pH 2.0 with 120 min of contact time. Maximum adsorption capacity of 114.9 mg g–1 was acquired for TW-Fe3O4-EDTA which is much higher than the recently developed adsorbents for Cr(VI) removal. Adsorption process was well explicated by Freundlich isotherm model and the adsorption rate is described in accordance with pseudo-second order kinetic model. It was observed that common salts did not have a notable influence on Cr(VI) adsorption. The results of the study indicated that TW-Fe3O4-EDTA can be applied as an effective adsorbent in heavy metal removal as an alternative to many expensive adsorbents available in the literature.
- MakaleAçık Erişim2023Energy and economic assessments of waste heat recovery by designs of economizer, condensing economizer and air preheater; [Ekonomizer, yoğuşmalı ekonomizer ve hava ön ısıtıcı tasarımları ile atık ısı geri kazanımının enerji ve ekonomik değerlendirilmesi]
Terhan, Meryem; Özağdaş, Emre; Omar, Muhammed Arslan
In this study, the waste heat loss of flue gases from the boilers of Kafkas University district heating system has been calculated between 6-8% according to the combustion analysis and the annual cost of this heat loss has been found as $58,658.79. In terms of energy efficiency and the national economy, we think that this lost energy should be recovered as much as possible and fuel and energy savings should be achieved. In the paper, the effects of variants such as air excess coefficient, flue gas temperature, boiler capacity and fuel consumption on the heat recovery from flue gas have been presented in detail. The heat recovery scenarios have been presented for reusing this waste energy for space heating, domestic hot water, and preheating combustion air and the applicability of these scenarios has been investigated in terms of thermodynamics and economics. According to the results of the study, in the second scenario examined to cover the domestic hot water need of the guest house building, the energy savings of the scenario can be provided during 20 years of economic life is $122,820.83, and it has the highest savings income among the scenarios. In addition, it is possible to recover approximately 50% of the flue gas loss with thanks to the scenario. On the other hand, the third scenario of heating the boiler combustion air with waste heat is the easiest and most economical scenario because its payback period is only one year, and there are no extra excavation and pipe costs.
- MakaleAçık Erişim2023Enhancement of adsorptive removal efficiency of an anionic dye from aqueous solutions using carboxylic acid-modified mulberry leaves: Artificial neural network modeling, isotherm, and kinetics evaluation
Duran, Celal; Ozeken, Sengul Tugba; Camoglu, Aslihan Yilmaz; Ozdes, Duygu
Natural mulberry leaves and carboxylic acid-modified mulberry (Morus alba L.) leaves were used for the first time to scrutinize the effects of modification on the retention efficiency of an anionic dye (Remazol Brilliant Blue R (RBBR)) from aqueous solutions to suggest an economical and promising adsorbent for the treatment of dye-contaminated water. The characterization of the adsorbents was accomplished through common techniques including SEM, FTIR, and pHpzc determination. Several parameters studied in batch experiments pointed out that the initial pH of 2.0 and the contact time of 240 min were optimum conditions for all the developed RBBR uptake processes. An artificial neural network (ANN) model was applied to formulate a forecast model for the uptake efficiency of RBBR. The experimental data were assessed by different kinetic and isotherm models to explain the mechanism of the developed processes in more detail. Maximum monolayer adsorption capacities of natural mulberry leaves and acetic acid-, citric acid-, and oxalic acid-modified mulberry leaves were determined as 64.5, 95.2, 84.8, and 91.7 mg g1, respectively, by the Langmuir isotherm model. These results demonstrated that the modification with carboxylic acids significantly increases the anionic dye adsorption capacity of the mulberry leaves.
- MakaleYayıncıda açık erişim2023HOW PRO-ENVIRONMENTAL AND SAVING BEHAVIOURS DETERMINE ORGANIC PRODUCT AND SECOND-HAND PRODUCT PURCHASE INTENTIONS: A STUDY IN TURKEY; [Kako prookolišno i štedljivo ponašanje određuju namjeru kupnje organskih i rabljenih proizvoda: istraživanje u Turskoj]
Avci, Ibrahim
The study focuses on sustainable consumption, which has recently gained popularity. The study seeks to ascertain the effects of pro-environmental behaviour and saving behaviour, both of which are constructs of sustainable consumption behaviour, on the organic and second-hand product purchase intention. Convenience sampling method was used in the collection of data, in which any consumer could participate, and the data were collected with a prepared online questionnaire. According to the findings of the study conducted on 595 Turkish consumers, pro-environmental behaviour and saving behaviour have positive effects on second-hand product purchase intentions, while pro-environmental behaviour has a positive effect on organic product purchase intention and saving behaviour has a negative effect on it. These findings make significant contributions to the literature and practice of sustainable consumption.
- BildiriYalnız künye2023IMPORTANCE OF STATIC TESTS FOR THE PREDICTION OF AMD POTENTIAL OF CEMENTED PASTE BACKFILL
Cihangir, Ferdi; Koc, Ercument; Orak, Mursel; Deveci, Taha Yavuz; Ercikdi, Bayram; Trofymchuk, O.; Rivza, B.
Cemented paste backfill (CPB) is an engineering mixture of mine tailings, cement and water. Tailings can commonly contain sulphidic minerals. In this case, acid mine drainage (AMD) may occur due to the oxidation of sulphidic minerals present in the body of the CPB. In general, AMD lowers the pH of the medium and water environment and may cause heavy metal release. Therefore, AMD potential is an important parameter to be considered with regard to environmental aspect. Static tests are widely used to determine the AMD potential of sulphidic materials. When neutralization capacity is higher than the acid generation potential, tailings can be safely stored from an environmental point of view. In this study, AMD potential of CPB material produced from sulfur-containing fine tailings is investigated. In this scope, a static modified ABA test was performed on fine sulphidic tailings (TA) and CPB produced from the same sulphidic tailings+7%wt. SR5 cement+water for the first time. Findings suggests that the CPB material had a lower AMD potential (~10%) compared to the tailings. Acid generation capacity of both tailings and the CPB was found to be dominant due to the high sulphide content (~30%wt. and ~28%wt.), respectively. However, CPB was observed to maintain its structural integrity and did not release acidic water for at least 40 weeks. This study showed that a well-designed CPB can be effectively used as an environmentally friendly mine tailings management method.
- MakaleYalnız künye2023Application of Magnetic Fe3O4 Alnus glutinosa Sawdust Biochar/SiO2/CTAB as a New Sorbent for Magnetic Solid Phase Extraction of Heavy Metals from Fruit and Waters Samples
Duran, Celal; Ozdes, Duygu
The coating of magnetic Fe3O4 Alnus glutinosa sawdust biochar with SiO2 and further functionalising by cetyltrimethyl ammonium bromide (CTAB), a cationic surfactant, was described for the first time in the current paper. The magnetic Fe3O4 Alnus glutinosa sawdust biochar/SiO2/CTAB(MAGBC/SiO2/CTAB) was implemented to separate and preconcentrate the Cu2+, Cd2+, and Pb2+ions efficiently in waters and a number of fruit samples by solid-phase extraction (SPE) method. Adsorbent characterisation was realised by fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). Fundamental factors affecting the extraction yield of the analyte ions including solution pH, adsorbent amount, sample volume and desorption contact time were fully researched and optimised as 8.0, 0.25 g, 500 mL and 60 min, respectively, and the eluent was specified as 5.0 mL of 0.1 M of HCl solution. The adsorption equilibrium eventuated after 15 min of contact time and it was noticed that the chemisorption mechanism was dominant upon the analyte ions adsorption. The limits of detection (LOD) were calculated as 0.24, 0.62 and 1.55 µg L−1 and the limits of quantitation (LOQ) were determined as 0.81, 2.08, and 5.17 µg L−1 for Cu2+, Cd2+, and Pb2+ ions, respectively. The relative recoveries (RR%) were in the ranges of 93.3–103.4%, 92.5–102.8%, and 91.8–101.9% for Cu2+, Cd2+, and Pb2+ ions, respectively, while the relative standard deviations (RSD%) were obtained lower than 4.0% (n = 10) by applying the method at optimised conditions. The maximum adsorption capacities of MAGBC/SiO2/CTAB were obtained as 123.7, 80.0 and 118.5 mg g−1for Cu2+, Cd2+, and Pb2+ions, respectively. Consequently, the developed new, simple, rapid, sensitive, and economical SPE method based on MAGBC/SiO2/CTAB was successfully implemented to waters and some of the fruit samples to determine the Cu2+, Cd2+, and Pb2+ions simultaneously.
- MakaleAçık Erişim2022Atık Malzemelerin Çimentolu Macun Dolgunun Dayanım-Duraylılık Performansına ve Üretim Maliyetine Etkisi
Yilmaz, Tekin; Ercikdi, Bayram
Bu çalışma ile çimentolu macun dolgu (ÇMD) karışımında sülfürlü-maden atığı (S-MA) yerine %15 oranında ikame edilen atık malzemelerin (inşaat-yıkıntı atığı: İYA, kireçtaşı: KT, uçucu kül: UK ve yüksek fırın cürufu: YFC) ÇMD’nin dayanım/duraylılık performansına ve üretim maliyetine etkisi incelenmiştir. Bu amaçla, üretilen ÇMD numuneleri (kontrol: ve %15 atık malzeme ikameli) 7-360 gün boyunca dayanım testine tabi tutulmuştur. ÇMD üretim maliyetinin araştırılması için karışımlarda kullanılan çimento miktarları ve maliyetleri belirlenirken, atık malzemelerin öğütme sırasındaki enerji tüketimleri ve maliyetleri hesaplanmıştır. Tüm numuneler kısa ve uzun dönemde istenen 1,0 MPa dayanımı sağlamış ve %15 UK ve YFC ikameli ÇMD numuneleri kontrol numunelerine kıyasla 4 kata kadar daha yüksek dayanım üretmiştir. 1,0 m3 ÇMD üretimi için kontrol karışımında 130,0 kg çimento (%8,5) kullanılırken, atık malzeme ikameli karışımlarda bağlayıcı oranının %1,0 düşürülmesi yaklaşık %15 çimento tasarrufu sağlamıştır. Atık malzemelerin öğütme işlemlerinde 6,55-18,89 kW-saat/ton elektrik enerjisi tüketilmiş ve böylece 2,99 ₺ (UK)-8,85 ₺ (İYA) arasında para harcanmıştır. ÇMD üretimi için toplam maliyet değerlendirildiğinde, kontrol karışımı için 153,4 ₺ harcanırken, %15 atık malzeme ikameli karışımların maliyetinin 133,5 ₺’ye kadar (%12,98’e kadar tasarruf) düşürülebilmesi öngörülmüştür. Sonuçlar, ÇMD’nin dayanım/duraylılık performansı ve üretim maliyeti konusunda en uygun karışım tipinin %15 UK ikameli ÇMD karışımı olduğunu göstermiştir.
- MakaleAçık Erişim2022Avrupa birliği emisyon ticaret sistemi çerçevesinde kirleten öder ilkesi
Uğur, Candan Yılmaz
1970'li yıllarda tüketimin ön planda tutulduğu, çevre ile ekonomik kalkınma arasındaki doğal bağın göz ardı edildiği kontrolsüz bir kalkınma sürecinin farkına varılması, AB'de çevreye ve iklime duyarlı bir kalkınma planı arayışına yol açmıştır. BM İklim Değişikliği Çerçeve Sözleşmesi süreci ile başlayan ve daha sonra AB temel mevzuatına dahil edilen kirleten öder ilkesi, bu kapsamda uygulanmaya başlanmıştır. Bu çalışmada, AB iklim değişikliği politikaları kapsamında uygulanan kirleten öder ilkesi ele alınmaktadır. Kirleten öder ilkesi; AB'nin iklim değişikliği ile mücadelesi kapsamında ele alınacak ve karbon (CO2) emisyonlarının neden olduğu negatif dışsallıkların içselleştirilmesindeki rolü tartışılacaktır.
- MakaleAçık Erişim2022Biyogazla Birlikte Oluşan Diğer Ürünlerin Araştırılması
Saribiyik, Oguz Yunus
Gelişmekte olan ülkelerin enerji tüketimindeki yükselme atmosfere karbondioksit salınımını artırarak küresel ısınmaya sebep olmaktadır. Küresel ısınmaya bağlı olarak ortaya çıkan doğal afetler insanların yaşamlarını olumsuz yönde etkilediklerinden dolayı atmosfere karbondioksit salınımının kontrol altına alınıp sürdürülebilir hale getirilmesi gerekmektedir. Bu sebeple fosil kökenli yakıtlara alternatif kaynaklarının araştırılması zorunlu hale gelmektedir. Rüzgâr enerjisi, biyodizel vb. gibi alternatif biyoyakıtlar içerisindeki alternatif enerji üretim yöntemlerinden birisi de biyogaz üretimidir. Biyogaz üretiminde uygun organik atıklar kullanılarak %35-45 CO2, %55-65 CH4 oranlarda biyogaz karışımı üretilirken eser miktarda CO, H2S, NH3 gibi diğer ürünlerde ortaya çıkmaktadır. Yapılan bu çalışmada biyogaz üretiminde kullanılan sıvı fazda bulunan toplam karbon miktarı, fenolik içerik miktarları, Azot(N), Fosfor(P2O5), Potasyum(K2O), pH, Hümik asit, Fülvik asit ve iletkenlik gibi değerlerin değişimi biyogaz üretimi öncesi ve sonrasında test edilerek belirlenmiştir. Elde edilen sonuçlara göre N, P, K miktarlarında herhangi bir değişim ortaya çıkmazken pH değerinde yükselme, fenolik içerik, toplam karbon içeriği, iletkenlik, Hümik ve Fülvik asit içeriklerinde biyogaz üretim süreci sonrasında artış meydana geldiği gözlemlenmiştir.
- MakaleAçık Erişim2022Gıda Tedarik Zincirinde Taşımacılık Maliyetlerinin Minimizasyonuna Yönelik Bir Vaka Çalışması
Kisa, Ayse Cansu Gok; Peker, İskender; Demirkan, Yasin
Etkin tedarik zinciri yönetimi için işletmelerin lojistik maliyetlerden tasarruf etmeleri son derece önemlidir. Yapılan çalışmalar, taşıma faaliyetlerinin ortalama bir ürünün maliyetine etkisinin %10-%20 olduğunu göstermektedir. Bu nedenle, taşımacılıkta yapılan herhangi bir iyileştirme, maliyetin azaltılmasına yardımcı olacak ve işletmenin kârına önemli katkı sağlayacaktır. Bu çalışmanın amacı, Karadeniz Bölgesinin lojistik üssü olan Samsun ilinde dış ticaret yapan bir gıda şirketinin dış kaynak sağlayıcısının, taşıma maliyetlerini minimize etmektir. Bu kapsamda bir Araç Rotalama Problemi (ARP) modeli geliştirilmiştir. Çözüm sürecinde, kapasite harici kısıt olmaması, verilerin eksiksiz olması ve herhangi bir varsayımda bulunulmamasından dolayı sezgisel Tasarruf Algoritması kullanılmıştır. Veriler ürünlerin taşınması sırasında şirketin oluşturduğu sevk irsaliyelerinden elde edilmiştir. Müşterilerden gelen taleplerin dağıtımı haftanın iki gününde yapılmaktadır. Önerilen çözüm algoritması ile gerek rota mesafesinde gerekse taşıma maliyetlerinde önemli tasarruf elde edilmiştir.
- MakaleYalnız künye2022Investigation of usability of building rubble as road underfill
Külekçi, Gökhan; Osman Yilmaz, Ali
For resources to be used efficiently, the structures built on the earth must be long-lasting. The longevity of the roads built with a length of millions of kilometers per year is determined by the nature of the filling material, traffic, equivalent axle load, climatic effects, material fatigue, and layer thicknesses used. The fact that filling material complies with the standards and is easily available will ensure that the road construction works are both economical and long-lasting. Many building rubbles are formed from the buildings that have completed their lives in the urban transformation process. Storage and disposal of this building's rubble are very difficult. To eliminate these difficulties, the usage areas of the rubble should be increased. In this study, some mechanical experiments were carried out on the building rubble obtained from the Black Sea region, and these were interpreted. Grain density, freeze-thaw tests, Micro-Deval, and Determination of Fragmentation Resistance, tests were carried out according to TSE and ASTM standards of aggregates obtained from building rubble. The results obtained from the experiments were compared with the technical specifications of the General Directorate of Highways. It has been revealed that the analyzed aggregate can be used as road fill in highways.
- Derleme MakaleAçık Erişim2022Depremlerden Sonraki Yeniden Yapılanma Süreci Üzerine Küresel Bir Araştırma: Çelik Prefabrik Malzeme Kullanımının Gerekliliği
Öztürk, Serkan; Etki Of, Nesibe
Bu çalışma kapsamında, çelik prefabrik yapıların yapısal özellikleri, Türkiye ve dünyada kullanım oranları ve niçin kullanılması gerektiği konuları bilimsel kaynaklar ortaya konularak araştırılmıştır. Farklı çalışmalardan elde edilen sonuçlar derlenerek, afet yönetimi için oldukça önemli olan yeniden yapılanma sürecine dikkat çekilmiştir. Çelik yapılar, hafif ve esnek malzemeler oldukları için depreme karşı mukavemet gösterirler. Bu ve daha birçok özelliğinden dolayı yüz ölçümünün büyük bir bölümü deprem bölgesinde yer alan ülkemizde konutların çelik prefabrikasyon ile yapılması gerekmektedir, çünkü bu yapıların depremlerde yıkılmadığı veya hasar alarak ayakta kaldığı literatürdeki birçok araştırma sonucunda kanıtlanmış olup afet yönetiminde ileri seviyede bulunan ülkeler tarafından da kanıksanmıştır. Türkiye ise çelik üretiminde dünyada yedinci sırada bulunmakla birlikte, bu durum yapı sektörüne yansımamaktadır. Depremler yaşandıktan sonra yeniden yapılanma sürecine gelindiğinde, yıkılan veya ağır hasar alan binaların yerine çelik konstrüksiyon binaları inşa etmek gerekmektedir. Bu strateji, kriz yönetiminin son basamağı olan yeniden yapılandırmada sağlam temeller atmayı sağlayacak ve risk yönetiminin ilk basamağı olan zarar azaltma evresindeki çalışmaları destekleyici nitelikte olacaktır. Bu bağlamda, önemli bir kazanım olarak, tam anlamda bir bütünleşik afet yönetimi döngüsü oluşturulabilecektir.
- MakaleAçık Erişim2022Atık Sulardan Cd(II) İyonlarının Adsorpsiyonu için Doğal Adsorban Olarak Kızılçam (Pinus Brutia Ten.) Talaşının Performansının Değerlendirilmesi
Duran, Celal; Ozdes, Duygu; Torun, Erdem
Bazı ağır metallerin çok düşük derişimlerde bile vücuda alınımı, kan bileşiminin bozulmasına, merkezi sinir sistemi fonksiyonlarında azalmaya ve akciğer, böbrek ve karaciğer gibi organlarda hasarlara neden olabilir. Bu nedenle ağır metal iyonlarının, alıcı ortama verilmeden önce sulardan ve atık sulardan uzaklaştırılması gerekmektedir. Bu çalışmada, Cd(II) iyonlarının sulardan ve atık sulardan adsorpsiyon tekniğiyle gideriminde etkili ve ucuz bir adsorban olarak kızılçam (Pinus Brutia Ten.) talaşının kullanılabilirliği değerlendirilmiştir. Adsorpsiyon deneylerinde kullanılan kızılçam talaşı fiziksel veya kimyasal herhangi bir ön işleme tabi tutulmadan doğal olarak kullanılmıştır. Kızılçam talaşı, çeşitli yöntemlerle karakterize edildikten sonra adsorpsiyon verimi üzerine başlangıç sulu çözelti pH’ı, denge süresi, adsorban miktarı ve başlangıç Cd(II) derişimi gibi deneysel faktörlerin etkileri incelenmiş ve ayrıca endüstriyel atık sularda Cd(II) iyonlarıyla birlikte bulunabilecek bazı tuzların etkileri araştırılmıştır. Elde edilen sonuçlardan optimum pH 6.0 ve denge süresi 240 dk olarak belirlenmiştir. Mekanizma hakkında fikir edinmek için elde edilen verilere izoterm modelleri (Langmuir ve Freundlich) uygulanmıştır. Kızılçam talaşının maksimum adsorpsiyon kapasitesi Langmuir izoterm modeli kullanılarak 11.88 mg g-1 olarak hesaplanmıştır. Sonuç olarak kızılçam talaşının atık sulardan Cd(II) iyonlarının uzaklaştırılmasında etkili bir adsorban olarak kullanılabileceği ortaya konulmuştur.
- MakaleAçık Erişim2022A Challenge for Systemic Transformation towards Circular Healthcare Economy: Single-Use or Not?
Demır, Hüseyın; Karaer, Merve
The study aims to discuss the challenge of systemic transformation of healthcare economy in the context of disinfection and sterilization (DAS) process. The database of the Web of Science (WoS) has been used to obtain data. In R environment, a variety of analyzes have been conducted through the biblioshiny. Following the descriptive findings, trend words, trend word weights and related visuals have been obtained. Multiple correspondence analysis was used to evaluate the development course of trending words by year, and the ggplot2 package has been used to visualization. An attempt has been made to draw attention to the difficulty of the systemic transformation of the healthcare economy by supporting the circular approach concepts featured in the publications with knowledge and experience from the field. The number of publications and citations in the field has shown an increasing trend. Prominent studies have been conducted in the areas of infection control, dialysis, anesthesia, and analgesia. Trend words have shown that life cycle assessment, reuse, sterilization, reprocessing, etc. concepts have a high level of centricity and concentration. Similarly, multiple correspondence analysis findings have shown that a heavy reliance has been placed on DAS processes in recent studies. The results clearly show that the systemic transformation from a linear healthcare economy to a circular one will create challenges for hospital administrations. It is therefore assessed that a hybrid approach to the continued use of disposable products instead of a purely circular approach will be beneficial to the sustainability of healthcare.
- MakaleYalnız künye2022Karaağaç (Ulmus glabra) ve Dut (Morus alba) Talaşı ile Sulu Çözeltilerden Adsorpsiyon Yöntemiyle Rodamin 6G Giderimi
Duran, Celal; Reis, Ceyhun; Ozdes, Duygu
Bu çalışmada, canlı metabolizmasında toksik etki gösteren katyonik yapıda boyarmadde olan Rodamin 6G’nin (R6G) sulardan ve atık sulardan uzaklaştırılmasında doğal karaağaç (Ulmus glabra) (UGT) ve dut (Morus alba) (MAT) talaşlarının ucuz ve etkili adsorbanlar olarak kullanılabilirliği araştırılmıştır. R6G’nin gideriminde adsorban olarak literatürde ilk defa bu çalışmada kullanılan UGT ve MAT çeşitli yöntemlerle karakterize edilmiştir. Adsorpsiyon deneyleri kesikli sistemle yürütülmüş olup, R6G’nin adsorpsiyon verimi üzerine başlangıç sulu çözelti pH’ı, denge süresi ve başlangıç R6G konsantrasyonu gibi deneysel parametrelerin etkileri incelenmiştir. R6G’nin her iki adsorban üzerine adsorpsiyonu için optimum sulu çözelti pH’ının 7.0 ve denge süresinin 180 dakika olduğu görülmüştür. Adsorpsiyon mekanizmasının aydınlatılabilmesi için elde edilen deneysel verilere çeşitli kinetik (yalancı birinci ve ikinci mertebeden kinetik model ile parçacık içi difüzyon modeli) ve izoterm modelleri (Langmuir, Freundlich, Temkin ve Dubinin-Radushkevich) uygulanmıştır. Adsorpsiyon kinetiğinin, ikinci mertebeden kinetik modeli takip ettiği ve deneysel verilerin hem Langmuir hem de Freundlich izoterm modellerine iyi bir uyum gösterdiği tespit edilmiştir. UGT ve MAT’in maksimum adsorpsiyon kapasitesi Langmuir izoterm modeli kullanılarak sırasıyla 50.5 ve 31.8 mg g-1 olarak hesaplanmıştır. Yapılan çalışma sonucunda karaağaç ve dut talaşının boyarmadde gideriminde kullanılacak etkili ve düşük maliyetli alternatifler olabileceği görülmüştür.
- MakaleAçık Erişim2022The Effect Of Conspicuous Consumption Behavior On Wasteful Consumption Behavior: The Intermediary Role Of Hedonic Consumption Behavior
Avci, Ibrahim
The concept of consumption, which has an important place in people's lives, is generally expressed as the use of produced goods and services in line with needs. Consumption now includes the psychological needs of people as well as their physical needs. Consumers can buy things they do not need by acting pleasure-orientedly, and they exhibit consumption behaviors to provide psychological satisfaction. One of the consumer-purchase patterns is found to demonstrate others in the social environment. Therefore, non-need consumption focused on pleasure and display causes excessive consumption; this situation can also cause wastefulness. Accordingly, in the present study, the aim was to examine the effect ofconspicuous consumption behavior on wasteful consumption behavior and the mediating role of hedonic consumption behavior in this effect. With the online survey form prepared, 519 participants were reached between the dates of 21.05.2020-06.07.2020. The data obtained were analyzed with the SPSS 21, AMOS 24, and PROCESS 3.5 programs. After the analysis, it was concluded that conspicuous consumption behavior has an effect on wasteful consumption behavior and that hedonic consumption behavior has a mediating effect.
- MakaleAçık Erişim2022The cultural practice of decluttering as household work and its potentials for sustainable consumption
Muster, Viola; Iran, Samira; Muensch, Marlene
Popular literature and guidebooks on minimalism and decluttering have brought the idea of less is more into the mainstream. Although decluttering constitutes a central household chore in consumer societies, it is rarely communicated as work within the current popular minimalism discourse, but rather as an expression of self-care. Whether and to what extent this lifestyle minimalism can contribute to sustainable consumption has - with a few exceptions - not yet been studied in detail. In this article, decluttering is first conceptualized in between housework and self-care. Based on this work, potentials and limits for the promotion of sustainable consumption are outlined. Finally, initial insights from an ongoing citizen science project on decluttering in Germany are presented. The qualitative results from two workshops and two reflection exercises show that the main motivation for participants is the dissatisfaction with their multitude of possessions and the desire for fewer material possessions in the future. The decision to declutter can be understood as a window of opportunity in which individuals are willing to reflect on and realign their possessions and desires for goods. Thus, we argue that decluttering can be a relevant starting point for changing consumption behavior toward (more) sustainable consumption. At the same time, it remains unclear whether and to what extent the participants' willingness to change regarding possessions and consumption actually leads to more sustainable consumption behavior after decluttering. It is even conceivable that the newly gained space will stimulate additional consumption. Decluttering would then rather function as a catalyst for further consumption (and would have no or rather a negative contribution to sustainability goals). Further research is needed to shed light on this.
- MakaleYalnız künye2022Production of grape pekmez by Ohmic heating-assisted vacuum evaporation
Tunç, Merve Tuçe; Akdoğan, Arda; Baltacı, Cemalettin; Kaya, Zeliha; Odabaş, Halil İbrahim
Pekmez is a concentrated syrup-like food conventionally produced by vacuum evaporation process from sugar-rich fruits. In this study, the applicability of grape pekmez production by ohmic heating assisted vacuum evaporation (ΩVE) method was investigated. Conventional vacuum evaporation (CVE) and ΩVE methods were compared in terms of physicochemical properties, HMF (5-hydroxymethylfurfural) contents, rheological properties, and energy consumptions. ΩVE was run at four different voltage gradients (17.5, 20, 22.5, and 25 V/cm). Total process times for grape pekmez production were determined as 57, 28.5, 32, 39, and 50 minutes for CVE, ΩVE (25 V/cm), ΩVE (22.5 V/cm), ΩVE (20 V/cm) and ΩVE (17.5 V/cm), respectively. Energy consumption of CVE method was higher than ΩVE method for all voltage gradients. Energy efficiency increased as the voltage gradient increased. There was no significant difference between CVE and ΩVE methods for HMF contents. The results show that the ΩVE method could be an alternative to the CVE process for grape pekmez production.
- Derleme MakaleYalnız künye2022Evaluation of By-Products of Potato Peel as Food Additive
Yuksel, Ferhat; Durmaz, Aysun
The potato plant is an important food source produced all over the world and it provides a significant portion of daily energy intake in nourishment. In addition, a significant rate of vitamins, fibre, mineral matters, protein, and fat can be obtained by consuming potato. In this study, the produc-tion, consumption, and usage areas of potato, a crucial source of our diet, and the possibilities of using it as food additives with the nutritional properties of its peel have been investigated. Generally, potato is consumed after its peel is removed in the homes and industrial areas and many of these peels are disposed off as wastes. Studies show that potato peel has a high content of dietary fibre, protein, car-bohydrate, mineral matters, vitamin, phenolic, and antioxidant. The use of potato peel as food additives have also been discussed in this study.
- MakaleAçık Erişim2022Investigation of gamma ray absorption levels of composites produced from copper mine tailings, fly ash, and brick dust
Külekçi, Gökhan
To date, heavyweight concretes have been produced from various heavy aggregates as radiation insulation materials, and their gamma ray absorption levels have been investigated. Many of the studies have used heavy aggregates instead of cement or coarse aggregates from composite material components. The present study prepared lightweight concretes using copper mine tailings, clay brick dust, and fly ash instead of fine aggregates. Some mechanical tests (density, compressive strength, and ultrasonic pulse velocity) were performed on composite blocks with dimensions of 5*5*5 cm, and radiation interaction parameters [linear absorption coefficient (cm−1), mass attenuation coefficient (cm2/gr), HVL (half-value layer) (cm), MFP (cm), and permeability (%)] were measured. Radiation interaction parameters were obtained using a HPGe gamma detector. Radiation measurements were performed at five different photon energies: 583 keV (133Ba), 609 keV (133Ba), 662 keV (137Cs), 911 keV (133Ba), 1173 keV (60Co), and 1332 keV (60Co). Additionally, the compressive strength and UPV values of composite materials were associated with their gamma ray permeability. Tests revealed that samples with the addition of copper mine tailings yielded the best energy absorption at all energy levels and that absorption decreased as the energy level increased. For example, with the increasing of the energy level, mass attenuation coefficients decreased. The highest mass attenuation coefficients were obtained as 0.128 cm2/g at an energy level of 583 keV in composites produced from copper mine tailings. On the other hand, it was measured at the same energy level as 0.069 cm2/g (a 46% decrease) in the composites produced with fly ash. In addition, it was observed that fly ash used as a fine aggregate did not have a significant effect on mass attenuation coefficient and could be used as a gamma shield if the material thickness was increased to an average of 14 cm. This study revealed that tailings materials could be used as radiation shields. This study also demonstrated that not using heavy aggregates and producing lightweight concrete in radiation shield production significantly reduced shield production cost.
